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Aerobic respiration needs oxygen, and it produces carbon dioxide as a waste product. The human respiratory system contains the organs that allow us to get the oxygen we need and to remove the ...
“There are two sources of ‘gas,’ and not all gas is gas. Part of what we pass is air. We all swallow some air, and some people swallow a lot of air. Now that seems to be odorless.
Human activities, such as making fertilizers ... Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere.